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The proportion of CO₂ in the atmosphere is approximately 0.034%. The primary components of air are nitrogen and oxygen.

1. Acid rain caused by sulfur dioxide emissions from the Mathura refinery poses a significant threat to the Taj Mahal.
2. Air pollution in metropolitan areas is primarily caused by emissions from vehicles.
3. Noise levels exceeding 80 dB are considered dangerous to human health.
4. Lead (Pb) is the most harmful metal pollutant found in vehicle emissions.

Correct answer: Acid rain caused by sulfur dioxide emissions from the Mathura refinery poses a significant threat to the Taj Mahal.

Solution

The Taj Mahal is indeed threatened by acid rain caused by sulfur dioxide emissions from nearby industries like the Mathura refinery. This is a well-documented environmental issue.

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